Sunnyheat against night storage heater Pt3

Just a reply from a happy customer!

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Hi Sunnyheat!

The log shows total 192 hours of “on” time and 111 kWh consumption. That is .57 unit per hour ~€2 per day, the storage heater and convection heater would have used 380 kWh, this is brilliant I think, the employee has turned off the convection heater and storage heaters. The only thing is the room is heated at the weekends when it is not needed so I need to adjust the programme.

Thanks for superb customer support.
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This shows that even though we now can heat the rooms to the desired temperature (which wasn't possible with the night storage heater, therefore an extra convection heater was used) we are still able to reduce the cost of electricity by about 70%!

Temperature of the rooms is standard 22 degrees during day, 17 at night. During the day it can be pushed up to about 24 degrees by employee. Measurements taken during January 2011.

See part of log, starts at 17 degrees, 4 o'clock at night, goes up to 23.5. You can see that the room temperature drops automatically from 23.5 to 17 degrees at 17:30. The room drops quickly from 23.5 to 20.5 within half an hour and finally arrives at the 17 degrees at about 21:30 at a rate of about 1 degree per hour. During this period the panel doesn't have to do anything and starts keeping the room at 17 degrees from 22:00 till 08:30 when it starts heating it from 17 to 22 degrees. Outside temperature that day was 2 degrees, frost at night of about -6.

ID,date, time, temp, humidity%,dew point

721,12/01/2011 04:00:00,17.0,47.0,5.6
781,12/01/2011 05:00:00,17.0,47.5,5.8
841,12/01/2011 06:00:00,17.0,47.0,5.6
901,12/01/2011 07:00:00,17.0,46.5,5.5
961,12/01/2011 08:00:00,17.0,46.5,5.5
1021,12/01/2011 09:00:00,20.5,42.5,7.3
1081,12/01/2011 10:00:00,22.0,40.0,7.8
1141,12/01/2011 11:00:00,23.0,38.5,8.1
1201,12/01/2011 12:00:00,23.5,38.5,8.6
1261,12/01/2011 13:00:00,23.5,39.5,8.9
1321,12/01/2011 14:00:00,23.5,41.0,9.5
1381,12/01/2011 15:00:00,23.5,41.0,9.5
1441,12/01/2011 16:00:00,23.5,42.0,9.9
1501,12/01/2011 17:00:00,23.5,41.0,9.5
1561,12/01/2011 18:00:00,20.5,45.0,8.2
1621,12/01/2011 19:00:00,19.0,47.0,7.4
1681,12/01/2011 20:00:00,18.0,48.5,7.0
1741,12/01/2011 21:00:00,17.5,49.5,6.8
1801,12/01/2011 22:00:00,17.0,49.5,6.4

Sunnyheat against storage heaters pt2

The graph below shows the print room temperature and humidity levels in October. The Sunnyheat panels maintained a set temp of 20.5 Degrees (DAY AND NIGHT) and used 730 kWh of electricity in the process while reducing humidity range. That’s an energy saving of 46% over using storage heating, which is not controllable or effective. The cost saving is estimated to be 80 cents a day although in the summer the saving was €3.80 per day. The Sunnyheat panels have a fully programmable remote controlled thermostat and the long wave radiant heat does not heat the air but rather the fabric of the building and its contents. As the surface temperatures are higher the air temperature does not need to be as high in order for thermal comfort levels to be achieved. Storage heaters primarily heat the air which is easily lost in a leaky building. The operator is very happy with the comfort levels in the print room now. The Sunnyheat panels are designed to replace tiles in suspended ceilings. http://www.sunnyheat.ie/

The graph below shows the storage heaters and convection heaters in Dec 2009, the temperature in the room struggled to get to 20 Deg and the humidity was all over the place.

Night Storage Heater versus Infrared Heater

Ran a project in an old building, not so well insulated office/print room in Wexford. Installed two 60x120 Sunnyheat infrared panels in two adjacent rooms, one in each room. These panels were set at 18 degrees during night and 21 degrees during the day. Started measuring at the 2nd of June 2010. The Sunnyheat panels used up to 1st of September 2010 resp. 79kWh, 123kWh, which totals 202kWh.

The night storage heaters that heated these rooms before came on every night and used in the same period last year: 6kWh * 6 hours * 5 days * 8 weeks = 1440kWh.

This saved our customer 200 euro in the space of 8 weeks!!!